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Experimentally Induced Language Modes and Regular Code-Switching Habits Boost Bilinguals' Executive Performance:
Julia Hofweber1,2, Theodoros Marinis2,3, Jeanine Treffers-Daller4
1Department of Psychology and Human Development, Institute of Education, University College London, London, United Kingdom.
Frontiers in Psychology
|November 30, 2020
Summary
Bilingualism impacts executive functions (EFs) by engaging inhibitory control, with performance varying based on language mode and individual dominance profiles. More balanced bilinguals show better EF in code-switching contexts.
Area of Science:
- Cognitive Neuroscience
- Psycholinguistics
- Bilingualism Research
Background:
- Bilingualism's effect on executive functions (EFs) is established, but the underlying mechanisms, particularly the role of language interaction and dominance, remain unclear.
- Existing research on code-switching often relies on self-reported habits, limiting experimental control over language modes.
- Understanding how different language modes and individual bilingual profiles influence EF is crucial for cognitive science.
Purpose of the Study:
- To investigate the impact of experimentally induced language modes (single language vs. code-switching) on bilinguals' executive functions.
- To differentiate the effects of various intra-sentential code-switching types (Insertion, Alternation, Dense) on EF performance.
- To examine the interplay between temporary language modes, sociolinguistic code-switching habits, and bilingual dominance profiles in shaping EF.
Main Methods:
- Employed experimental manipulation of language modes (single language, Insertion, Alternation, Dense code-switching) in German-English bilinguals (N=29).
- Assessed executive function performance across different language modes and compared bilinguals to monolinguals.
- Correlated individual L1-dominance with EF performance and analyzed sociolinguistic code-switching habits.
Main Results:
- Bilinguals exhibited superior EF performance in single-language contexts compared to code-switching conditions.
- Bilinguals demonstrated increased inhibitory control relative to monolinguals, supporting the role of inhibition in bilingual processing.
- Dense code-switching appeared to engage proactive control, distinct from the reactive control in Alternation; more balanced bilinguals performed better in bilingual conditions.
Conclusions:
- Bilingual language processing involves significant inhibitory control, with performance modulated by language mode and individual dominance.
- The type of code-switching influences the specific control mechanisms engaged, highlighting the complexity of bilingual executive functions.
- Sociolinguistic profiles, particularly dominance balance, are critical factors in understanding bilinguals' executive function performance, especially during language switching.
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